Willow - 360 Pump Spill-Proof Breast Milk Bags - 48 Ct - Holds 4 oz. Per Self-Sealing Storage Bag - Compatible with Willow 360 or 3.0 Wearable Hands Free Breast Pump is a Baby & Kids Feeding option for everyday use, business supply needs, resale shelves, or household stocking. Review product size, pack count, and shipping details before checkout.